Correctly handle homonymous lexemes

[Nudin]

Sometime two Lexemes have the same language and lemma but are still different (Homonym). In these cases the sense should be added to the right Lexeme. Ideally the user should be asked which Lexeme to pick.

Right now the sense will be matched and added to both – thus will be added to the wrong Lexemes.

[Nudin]

So that we don't add wrong data, I semi-manually removed all homonyms from the database.

[Daniel-Mietchen]

Here is another case: the target lexeme is Das Tag but the suggested glosses are all about Der Tag.

To make things worse, there is a whole range of different concepts described using the string "Tag" in German, e.g. as per https://de.wikipedia.org/wiki/Tag_(Begriffskl%C3%A4rung) , some of which have already been confused by users of the tool (e.g. as per this revert).

[fnielsen]

I have seen a lot of errors committed due to noun/verb mixup, see e.g, https://www.wikidata.org/w/index.php?title=Lexeme%3AL237321&type=revision&diff=1155328146&oldid=1105302514. Perhaps showing forms could help aliviate this problem.